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  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "Chapter 4: Expressions"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example upc.c, Page Number-57"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "\n",
      "def main():\n",
      "    #input from user\n",
      "    d=int(raw_input(\"Enter the first (single) digit: \")) \n",
      "    firstfive= raw_input(\"Enter first group of five digits\")\n",
      "    list1=list(firstfive) \n",
      "    i1=list1[0]\n",
      "    i2=list1[1]\n",
      "    i3=list1[2]\n",
      "    i4=list1[3]\n",
      "    i5=list1[4]\n",
      "    secondfive= raw_input(\"Enter second group of five digits\")\n",
      "    list2=list(firstfive) \n",
      "    j1=list2[0]\n",
      "    j2=list2[1]\n",
      "    j3=list2[2]\n",
      "    j4=list2[3]\n",
      "    j5=list2[4]\n",
      "    first_sum=d+int(i2)+int(i4)+int(j1)+int(j3)+int(j5)\n",
      "    second_sum=int(i1)+int(i3)+int(i5)+int(j2)+int(j4)\n",
      "    total=3*first_sum+second_sum\n",
      "    s=9-((total - 1) % 10)\n",
      "    print \"Check digit: %d\" % s #print result\n",
      "    \n",
      "if  __name__=='__main__':\n",
      "    main()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter the first (single) digit: 0\n"
       ]
      },
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter first group of five digits13800\n"
       ]
      },
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter second group of five digits15713\n"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Check digit: 2\n"
       ]
      }
     ],
     "prompt_number": 1
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example on Page number-59"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "\n",
      "#variable declaration\n",
      "i = 1\n",
      "#k = l + (j=i)\n",
      "j=i\n",
      "k=1+j\n",
      "print \"%d %d %d\" % (i,j,k)  #prints \"1 1 2\" \n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "1 1 2\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example on Page number-61"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "i=1 #variable declaration\n",
      "i+=1\n",
      "print \"i is %d\" % i #++i\n",
      "print \"i is %d\" % i #i\n",
      "\n",
      "i = 1\n",
      "j=i+1\n",
      "print \"i is %d\" % i #i++\n",
      "print \"i is %d\" % j #i\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "i is 2\n",
        "i is 2\n",
        "i is 1\n",
        "i is 2\n"
       ]
      }
     ],
     "prompt_number": 5
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example on Page number-62"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "i=1 #variable declaration\n",
      "i-=1\n",
      "print \"i is %d\" % i #--i\n",
      "print \"i is %d\" % i #i\n",
      "\n",
      "i = 1\n",
      "j=i-1\n",
      "print \"i is %d\" % i #i--\n",
      "print \"i is %d\" % j #i"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "i is 0\n",
        "i is 0\n",
        "i is 1\n",
        "i is 0\n"
       ]
      }
     ],
     "prompt_number": 6
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    }
   ],
   "metadata": {}
  }
 ]
}